Low diffusivity paper for sublimation printing
A protective barrier well suited for use in sublimation printing is made primarily from cellulose fibers. The protective barrier, which can comprise an uncoated paper, can be used to prevent sublimation inks from bleeding through a fabric onto the printing equipment. The uncoated paper is recyclable and can enter the paper recycle stream. The uncoated paper can contain first cellulose fibers combined and blended with second cellulose fibers that differ in fiber length and/or in the degree of refining. The uncoated paper is constructed to have a relatively low diffusivity.
1. A protective barrier suited for use in sublimation printing processes comprising:
an uncoated paper comprising a first cellulose fiber combined and blended with a second cellulose fiber, the first cellulose fiber being different than the second cellulose fiber in average fiber length, in an amount of fiber refining, or in both average fiber length and amount of fiber refining, the uncoated paper having a cellulosic fiber content of greater than about 90% by weight, the uncoated paper having a diffusivity of less than about 0.025 cm/sec.
2. A protective barrier as defined in claim 1 , wherein the uncoated paper has a cellulose fiber content of greater than about 95% by weight.
3. A protective barrier as defined in claim 1 , wherein the protective barrier comprises a single layer of the uncoated paper.
4. A protective barrier as defined in claim 1 , wherein the uncoated paper has a diffusivity of less than about 0.015 cm/sec and greater than about 0.001 cm/sec.
5. A protective barrier as defined in claim 1 , wherein the uncoated paper contains filler particles in an amount less than about 2% by weight.
6. A protective barrier as defined in claim 1 , wherein the uncoated paper has a basis weight of from about 14 gsm to about 29 gsm.
7. A protective barrier as defined in claim 1 , wherein the uncoated paper has not been calendered.
8. A protective barrier as defined in claim 1 , wherein the first cellulose fibers comprise softwood fibers and the second cellulose fibers comprise softwood fibers.
9. A protective barrier as defined in claim 1 , wherein the first cellulose fibers have an average fiber length that is longer than the second cellulose fibers.
10. A protective barrier as defined in claim 1 , wherein the first cellulose fibers are less refined than the second cellulose fibers.
11. A protective barrier as defined in claim 1 , wherein the first cellulose fibers have a longer average fiber length than the second cellulose fibers and wherein the first cellulose fibers are less refined than the second cellulose fibers.
12. A protective barrier as defined in claim 1 , wherein the first cellulose fibers have a degree of refining between 20° SR to 50° SR.
13. A protective barrier as defined in claim 1 , wherein the uncoated paper contains a binder.
14. A protective barrier as defined in claim 13 , wherein the binder comprises a starch, a starch derivative, a cellulose derivative, or mixtures thereof.
15. A protective barrier as defined in claim 1 , wherein the first cellulose fibers are contained in the uncoated paper in an amount from about 30% to about 70% by weight and the second cellulose fibers are present in the uncoated paper in an amount from about 70% to about 30% by weight.
16. A protective barrier as defined in claim 1 , wherein the uncoated paper has a permeability of from about 2 Coresta to about 7 Coresta.
17. A protective barrier as defined in claim 1 , wherein the uncoated paper includes a first side and a second side, the protective barrier further comprising a transferable image applied to the first side of the uncoated paper comprising at least one sublimation dye.
18. A kit for sublimation printing comprising:
a transfer sheet including a transferable image on one surface of the transfer sheet, the transferable image comprising a sublimation dye; and
a protective paper comprising the protective barrier as defined in claim 1 .
19. A process for transferring an image to a fabric substrate having a first surface and a second and opposite surface comprising:
placing a transfer sheet adjacent to the first surface of the fabric substrate, the transfer sheet including a transferable image that is made from a sublimation dye;
placing a protective paper adjacent to the second surface of the fabric substrate, the protective paper comprising a protective barrier as defined in claim 1 ; and
placing the transfer sheet, the fabric substrate, and the protective paper into a heated press and subjecting the transfer sheet to heat and pressure sufficient to transfer the image to the first surface of the fabric substrate.